GARD – Installation, Operation and Maintenance Manual
A l e n c o n S y s t e m s L L C - P a g e
| 21
6 Communication
The communication with the GARD is carried out via ModbusTCP/IP through the Alencon PODD
device. The Modbus Map will be provided to you upon request.
7 GARD Installation
7.1 Understanding GARD Hardware
The GARD’s global status and channel statuses are indicated by LED's on the face of the GARD:
A Red light indicates that the channel is disconnected either due to a fault or a command while
Green light indicates that the channel is connected and running.
Emergency Switch
– The emergency switch is a push button that provides power to the relays.
The switch has been configured to operate in the NC position, providing 24 V power to the
internal relays. If an operator wants to turn-off (OPEN) the relays safely on the field, they would
have to push the button in towards the GARD. This will put the switch in the NO position,
disconnecting the power to the relays. To disengage the emergency switch, twist and pull the
knob away from the GARD, towards the operator.
Reset Switch –
This switch has been provided so the operator can forcefully reset
the GARD either after the occurance of a fault or the clearance of the fault. The push
button provides a hard reset which will will clear all flags and faults and force the
GARD into the standby state.
Note: The reset button will only work after the emergency switch has operated.
Channel LED’s –
The channel LED’s have a binary operation i.e. they are illuminated Green
if channel is in RUN mode and Red if it is in shutdown
Status LED –
The status LED is illuminated as soon as the PV voltage is applied to the GARD.
It is an indicator that remains RED throughout the operation of the GARD. The illumination is
an indication that the GARD controls are active and ready for operation.
Figure 10: Emergency Switch
Figure 11:
Reset Switch
